On experiments on oil-spill booms in three Atlantic coastal zones: La Rochelle, Lorient and Brest

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Muttin F.

10th International Conference on Modelling, Monitoring and Management of Water Pollution, Bucharest, Romania, 9 - 11 June 2010, vol.135, pp.49-60 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 135
  • Doi Number: 10.2495/wp100051
  • City: Bucharest
  • Country: Romania
  • Page Numbers: pp.49-60
  • Karadeniz Technical University Affiliated: No

Abstract

Abstract

PURPOSE:

To evaluate the diagnostic efficacy of quantitative Diffusion-weighted imaging (DWI) in the characterization of breast lesions of mass and non-mass enhancement (NME) types.

MATERIALS AND METHODS:

After the institutional review board gave approval, DWI exams of 267 women with 212 suspicious masses, 73 NMEs were retrospectively analyzed. Apparent diffusion coefficients (ADCs) of benign and malignant lesions were compared. Cutoff values were obtained by receiver operating characteristics analysis. Diagnostic accuracies of DWI for masses and NMEs were compared with the use of Chi-square test. The effect of the lesions histologic subtypes and size on diagnostic accuracies was evaluated.

RESULTS:

ADCs were significantly lower in malignants than in benigns for both masses (0.75 versus 1.21 × 10-3 mm2 /s,) and NMEs (0.79 versus 1.06 × 10-3 mm2 /s)(P < 0.001). Cutoff value was 0.90 × 10-3 mm2 /s for both lesion types. The accuracy of DWI was lower in NMEs (76.7%) than masses (89.2%) (P = 0.008) unrelated to lesion size. There was more overlap in ADCs of the benign and malignant NMEs due to the lower ADCs of the benign histologies of this group.

CONCLUSION:

Despite the lower diagnostic accuracy of DWI in NMEs, it could be helpful in the characterization of suspicious breast lesions of both mass and NME types.J. Magn. Reson. Imaging 2013. © 2013 Wiley Periodicals, Inc.

Copyright © 2013 Wiley Periodicals, Inc.

 

The intrinsic performance of the protection of coastal zones of the Atlantic against oil-spills by using floating booms needs to be Improved in the current conditions To define a contingency plan in advance, a one-dimensional numerical code has been used for many years A three-dimensional membrane finite-element method is proposed to give more complete results on boom geometry and boom stress To improve the booms' performances and validate numerical methods three experiments are described The first experiment is conducted in the open-sea harbour of La Rochelle, with current conditions higher than 3 knots In the Lorient oil wharf an experiment attempt shows the constraints due to the uncertainties of a coastal zone with harbour infrastructure under extension and intensive maritime traffic In the Elorn estuary, Brittany, France, a third experiment is described with current conditions bounded by 0 9 knots The environmental performance of a floating boom is also evaluated using an economic approach The budgets of these three experiments are evaluated and analyzed These budgets estimate the technical and human efforts needed to use a boom in such coastal zones The knowledge of both environmental and economical performances must be added to the theoretical performances given by numerical computations